NML 0.2.0 released

1.5 years after starting with NML we can finaly released version 0.2.0. The list of features, changes and fixes since 0.1 is too long to list. If all the features you want are supported by NML 0.2, we urge you to keep using it. NML 0.3 might have a few syntax-breaking changes, although we'll try to prevent that.

The 0.2 branch will be updated for a while with fixes, and this will be the last version to support OpenTTD 1.1.x. Starting with 0.3, NML will put it's focus on OpenTTD 1.2+.